That Lululemon chose this California-cool yogi to lead hundreds of people in al fresco downward dogs in Copley Square to fete its new Newbury store didn’t surprise her devotees: Kaufenberg’s challenging hip-hop classes are so much fun, we often forget we’re working out. Until the next morning, of course — when we wake up with new aches in our abs and new tunes to download (thanks to her thumping playlists).

Goldie Kaufenberg at Back Bay Yoga, Sweat & Soul Yoga, and Equinox | http://www.goldieyoga.com